NRF_LOG_INFO and printf does not work

[Winz]

Hello,

I am trying to print things from my board. I would like to go with NRF_LOG_INFO. I have the modules enabled, included the essential libraries, including the c files, but it does not work.

uint32_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
	NRF_LOG_INFO("Hi!");
	NRF_LOG_FLUSH();
	NRF_LOG_PROCESS();
	
    //gpio_init();
	pin_init();
	NRF_LOG_INFO("Pin Init OK?");
	NRF_LOG_FLUSH();
	NRF_LOG_PROCESS();
	
	comp_init();
	NRF_LOG_INFO("COMP Init OK?");
	NRF_LOG_FLUSH();
	NRF_LOG_PROCESS();
	
	NRF_LOG_INFO("Ready...");
	NRF_LOG_FLUSH();
	NRF_LOG_PROCESS();

I am using NRF52DK with SDK v14.20. I use PuTTY and have connected to the correct virtual COM port with the correct configuration.

Is there anything I may be missing?

Thank you in advance.

[Simonr]

Hi

Please make sure that you have set NRF_LOG_ENABLED 1 in sdk_config.h, as I can't see anywhere that you have. Also you shoud only use either RTT or UART, not both. And make sure that baudrate is 115200 in both sdk_config.h and in your terminal.

Best regards,

Simon

[Winz]

Hi Simon,

Yes, it has been enabled.

Yes, It was configured to use only UART, but still the same.

I have now turned off RTT, made sure that baudrate in 115200 in both sdk_config.h and terminal, but still does not work.

[Simonr]

Hi

Is the problem that you get an error when building your code? In that case, please post an error code for me to look into. Or is it just that your prints doesn't output in PuTTY? In that case you might have to look at how you call the print functions in your main.

Best regards,

Simon

[Winz]

Hi Simon,

No error message comes up after building my code.

Currently, my board does no longer work (halted?) after I ran this 3 lines of code:

	uint32_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();

If I commented them out, then there will be no problem.

[Simonr]

What example project are you using?

Can you check that you have set the following:

• #define NRFX_UART_ENABLED 1

• #define UART_ENABLE 1

• #define APP_UART_ENABLE 1

Best regards,

Simon